The days of purely human translation are finished. There is
simply too much translation required too quickly.
Computer assisted translation (CAT) is a software solution to assist a translator when
translating. In essence, the solutions delivered are a halfway stage between a human
translator and dedicated translation software - sometimes called machine translation
Using a C.A.T. tool a translator translates the work in matched sentences. These sentences
are then saved as translation memory of a specific piece of translation, in a specific
language, in a specific style, for a specific project. But the translation memories can be
saved as dictionaries for new work. So when similar work is offered the software
pre-translates everything it has in the original language combination. This way the more
CAT is used on a client's behalf, the faster the service will become.
The best use of C.A.T is to speed the time to market of, for example, a user or technical
manual. Only the differences have to be translated  usually 25 per cent of a
document.
Other advantages of C.A.T are allowing translation to proceed concurrently with the
source-language origination and the fact that the page layouts in manuals or web sites are
largely retained - there is less DTP required on the final documentation.
Moreover translation processed through CAT tools should cost between 30% and 70% less than
normal costs.
And the quality is usually higher.
From experience, and judged on a cost benefit basis we think the best is Deja Vu